linux-kernel - [PATCH v2 6/9] perf tools: add destructors for parse event terms

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Date:   Tue, 22 Oct 2019 17:53:34 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 6/9] perf tools: add destructors for parse event terms

If parsing fails then destructors are ran to clean the up the stack.
Rename the head union member to make the term and evlist use cases more
distinct, this simplifies matching the correct destructor.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/parse-events.y | 69 +++++++++++++++++++++++-----------
 1 file changed, 48 insertions(+), 21 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 545ab7cefc20..4725b14b9db4 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -12,6 +12,7 @@
 #include <stdio.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
+#include <linux/zalloc.h>
 #include "pmu.h"
 #include "evsel.h"
 #include "parse-events.h"
@@ -37,6 +38,25 @@ static struct list_head* alloc_list()
 	return list;
 }
 
+static void free_list_evsel(struct list_head* list_evsel)
+{
+	struct perf_evsel *pos, *tmp;
+
+	list_for_each_entry_safe(pos, tmp, list_evsel, node) {
+		list_del_init(&pos->node);
+		perf_evsel__delete(pos);
+	}
+	free(list_evsel);
+}
+
+static void free_term(struct parse_events_term *term)
+{
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
+		free(term->val.str);
+	zfree(&term->array.ranges);
+	free(term);
+}
+
 static void inc_group_count(struct list_head *list,
 		       struct parse_events_state *parse_state)
 {
@@ -66,6 +86,7 @@ static void inc_group_count(struct list_head *list,
 %type <num> PE_VALUE_SYM_TOOL
 %type <num> PE_RAW
 %type <num> PE_TERM
+%type <num> value_sym
 %type <str> PE_NAME
 %type <str> PE_BPF_OBJECT
 %type <str> PE_BPF_SOURCE
@@ -76,37 +97,43 @@ static void inc_group_count(struct list_head *list,
 %type <str> PE_EVENT_NAME
 %type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT
 %type <str> PE_DRV_CFG_TERM
-%type <num> value_sym
-%type <head> event_config
-%type <head> opt_event_config
-%type <head> opt_pmu_config
+%destructor { free ($$); } <str>
 %type <term> event_term
-%type <head> event_pmu
-%type <head> event_legacy_symbol
-%type <head> event_legacy_cache
-%type <head> event_legacy_mem
-%type <head> event_legacy_tracepoint
+%destructor { free_term ($$); } <term>
+%type <list_terms> event_config
+%type <list_terms> opt_event_config
+%type <list_terms> opt_pmu_config
+%destructor { parse_events_terms__delete ($$); } <list_terms>
+%type <list_evsel> event_pmu
+%type <list_evsel> event_legacy_symbol
+%type <list_evsel> event_legacy_cache
+%type <list_evsel> event_legacy_mem
+%type <list_evsel> event_legacy_tracepoint
+%type <list_evsel> event_legacy_numeric
+%type <list_evsel> event_legacy_raw
+%type <list_evsel> event_bpf_file
+%type <list_evsel> event_def
+%type <list_evsel> event_mod
+%type <list_evsel> event_name
+%type <list_evsel> event
+%type <list_evsel> events
+%type <list_evsel> group_def
+%type <list_evsel> group
+%type <list_evsel> groups
+%destructor { free_list_evsel ($$); } <list_evsel>
 %type <tracepoint_name> tracepoint_name
-%type <head> event_legacy_numeric
-%type <head> event_legacy_raw
-%type <head> event_bpf_file
-%type <head> event_def
-%type <head> event_mod
-%type <head> event_name
-%type <head> event
-%type <head> events
-%type <head> group_def
-%type <head> group
-%type <head> groups
+%destructor { free ($$.sys); free ($$.event); } <tracepoint_name>
 %type <array> array
 %type <array> array_term
 %type <array> array_terms
+%destructor { free ($$.ranges); } <array>
 
 %union
 {
 	char *str;
 	u64 num;
-	struct list_head *head;
+	struct list_head *list_evsel;
+	struct list_head *list_terms;
 	struct parse_events_term *term;
 	struct tracepoint_name {
 		char *sys;
-- 
2.23.0.866.gb869b98d4c-goog